image resize

Hi,
in the post pages , I see that the “arimolite_resize_image” function resize the “featured image” , how can I disable this?
please see this image : https://prnt.sc/rtmz7i
I see some code but I can not manage this. what I want is to show the original image in the post page : https://www.veronatappeti.it/website/showroom/gabbeh-3/ not the resized one by theme 51-696×675.jpg
Thanks